Dagger depressing mechanism



Sept. 22, 1942. r. R. Nix ETAL DAGGER DEPRESSING MECHANISM Filed Oct. 4, 1941 Tom HLPH N1 "4:0 J AMES HENRYJLVERT 3nventor5 4 Gttornegs Patented Sept. 22, 1942 UNITED STATES PATENT GFFICE.

DAGGER DEPRESSING MECHANISM Application October 4, 1941, Serial No. ll13,614

1 Claim.

This invention relates to a protector mechanism for looms and more especially to an adjustable spring-pressed member for urging the loom dagger to tripping position and also for applying the proper pressure upon the back binder of the shuttle box.

In most looms, it is necessary to provide a protector or stop motion mechanism so that the loom will stop upon the failure of the shuttle to properly box. To accomplish this result, suitable cantilevered daggers are often pivotally attached to the lay and the free ends of these daggers are normally held in an elevated, non-tripping position during the beat up stroke of the lay by the presence of the shuttle in one of the shuttle boxes. Upon the failure of the shuttle to properly box the free ends of the daggers are pressed downwardly by a conventional torsion spring to tripping position where the knock-off mechanism will be engaged upon the beat up stroke to thereby stop the loom. The abovenamed torsion spring not only exerts downward pressure upon the free ends of the daggers, but also simultaneously applies pressure upon the back binders of the shuttle boxes to assist in checking an incoming shuttle. This torsion spring requires frequent adjustment, and due to its inaccessible location beneath the lay, the adjustment is difficult to make.

It is an object of this invention to provide an adjustable spring-piessed plunger carried by the loom lay for normally depressing the free end of the loom dagger and also for simultaneously exerting pressure upon the back binder of the shuttle box. Since the dagger is a very accessible loom part, the present spring-pressed plunger may be easily installed to operate the same, and also may be easily adjusted after installation.

Some of the objects of the invention having been stated, other objects will appear as the description proceeds when taken in connection with the accompanying drawing, in which- Figure 1 is a side elevation of a portion of a loom, showing certain portions of the lay in section, and illustrating my improved dagger depressing mechanism;

Figure 2 is a sectional plan view taken along the line 2 2 in Figure 1, omitting the central portion of the loom;

Figure 3 is an enlarged vertical sectional view through the dagger depressing mechanism in an installed position.

Referring more particularly to the drawing, the numeral I denotes suitable vertically disposed loom swords, the upper ends of which support a horizontally disposed lay II. The bottom ends of these swords are mounted upon a suitable rocker shaft, not shown, which serves as a support about which the upper ends of the swords and the lay oscillate. The ends of the lay II have mounted thereon suitable race plates I2, each of said race plates I2 forming a part of a conventional shuttle box, which includes a box front I4 and a laterally movable back binder I5. The back binder I5 is normally disposed in spaced relation to the box front III and it is between the members I4 and I5 that a suitable shuttle I6 is adapted to be received and expelled during the normal operation of the loom.

In order that the shuttle I5 will be properly checked when it reaches the shuttle box, the binder I5 must be yieldingly pressed inwardly so that the side walls of the incoming shuttle will be frictionally engaged. This binder is pushed inwardly by means of the upper end of a lever I1, which lever, in turn, has its lower end adjustably secured on one end of a protector rod I8 by any suitable means such as set screw I9. By observing Figure 2, it will be seen that the protector rod I8 is substantially U-shaped and has the intermediate portions thereof rotatably mounted in the upper portions of the swords I0 as at 20. Also the intermediate portion of the protector rod I8 is disposed immediately beneath the lay II and in parallel relation thereto.

The protector rod I8 usually has two cantilevered daggers 25 integral therewith. These daggers extend laterally and slightly downwardly as seen in Figure 1, so that the 4free outer ends thereof will pass over suitable frogs 26 as the lay oscillates, These frogs 26 are slidably mounted upon loom frame 2I.

Each of the frogs has an inclined steel plate 28 disposed therein, the upper end of which is disposed slightly below the lower free end of the dagger 25 while the loom is in operation. As the lay oscillates, the shuttle I6 is thrown back and forth across the lay from one-shuttle box to the other. Upon the beat-up stroke of the lay, that is when the lay II is disposed to the right from the position shown in Figure 1, the shuttle I6 should be disposed within the shuttle box to thereby push the back binder I5 outwardly and consequently rotate the lever I'I, protector rod I8, and daggers 25 in a counter-clockwise manner to bold line position. If by any chance the shuttle does not become properly boxed, that is if 'it should not be thrown far enough into the box to cause the binder I 5 to be moved outwardly to the position shown, then the daggers 25 will be in the dotted line position as shown in Figure 1 where the free ends will engage the vertical faces 28a of frog steels 28 as the lay oscillates to the right. This engagement will cause the frogs 26 to slide a short distance to the right and thereby actuate the tripping or knock-01T mechanism for the loom.

The tripping mechanism in part comprises a flat plate 29 which is secured to one of the frogs 2B as at 30. The right hand end of the plate 29 is adapted to engage the lower end of a lever 3|, said lever being pivoted intermediate its ends as at 32 to the loom frame 21. The upper end of the lever 3| is adapted to engage a shipper lever 33 and this lever in turn controls the stopping of the loom. When the upper portion of the lever 33 is moved to the left in Figure l by the counter-clockwise rotation of lever 3|, the shipper lever 33 will be disengaged from a notch and permitted to move toward the observer a suicient amount to stop the loom.

The frogs 26 are normally forced to the left in Figure 1 to the position shown by means of a suitable Vcompression spring 31, one end of said spring abutting an interior wall of the frog and the other end engaging the loom frame as at 38.

In order to insure that the free end of each dagger 25 will be normally urged to a depressed position during bodily oscillation of the loom lay and its associated parts, a suitable dagger depressing mechanism has been provided. This mechanism comprises bracket 40, which bracket is secured to the front side of the lay I| by any suitable means such as bolt 4|. The outstanding leg of the bracket 40 has a collar 42 threadably secured therein, and this collar is held in the proper adjusted position within the outstanding leg by means of a suitable lock nut 43, said lock nut 43 being threadably secured around the collar 42. Collar 42 is provided with a longitudinal bore 44 which receives the sliding pin 45,

the lower end of said pin having a restricted threaded portion 45 around which is threadably mounted a nut 48. Nut 48 has a spherical lower surface 49 which rests upon the top side of dagger 25. The members 45 and 48 constitute a vdagger and whereby the amount of pressure Y plunger broadly designated by reference character 5|). The plungers 5l] are normally urged downwardly by means of a suitable compression spring 5|. 'Ihe upper end of the spring 5| is adapted to abut the lower end of collar 42, and the lower end of the spring is adapted to abut the upper side of cap member or nut 48. The amount of pressure which is normally exerted by the spring 5| may be adjusted by loosening the lock nut 43 and turning collar 42 the desired amount so that the lower end of the collar will serve to increase or decrease the pressure exerted by the spring 5| upon plunger 58 and dagger 25, depending upon the working condition of the loom. Two dagger depressor mechanisms are shown, but with a suciently rigid rod I8, one of the mechanisms will be suiiicient.

In the drawing and specification, there has been set forth a preferred embodiment of the invention and although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation, the scope'of the invention being set forth in the following claim.

We claim:

In a loom having an oscillating lay, a shuttle box on said lay, a dagger, a tripping mechanism and means'controlled by the presence of a shuttle in the box for holding the dagger in a non-contacting position relative to said tripping mechanism, a dagger depressing means comprising a bracket carried by said lay, an adjustment collar threadably mounted in said bracket and means to lock the collar in said bracket, a plunger having one end slidably mounted in said collar and having an enlarged head at one end thereof for engaging said dagger, a compression spring disposed around said plunger, one end of said spring engaging the head of the plunger and the other end abutting against said collar whereby the plunger will be urged axially against the exerted by said spring may be varied by adjusting said collar.

TOM RALPH NIX.

JAMES HENRY CALVERT. 

